<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>导航页</title>
</head>
<body>
    <nav>
        <p><a href="./上机3.1.html" target="a">第一个页面</a></p>
        <p><a href="./上机3.2.html" target="a">第二个页面</a></p>
        <p><a href="./上机3.3.html" target="a">第三个页面</a></p>
    </nav>
</body>
</html>